TABLE 2.
Association of explanatory variables with case fatality rate.
| Risk factor | Categories/Units | Survivors | Non‐survivors | OR (95% CI) | p | |
|---|---|---|---|---|---|---|
| Age | Years | Mean (SD) | 9.7 (3.0) | 11.3 (2.9) | 1.16 (0.97;1.39) | 0.09 |
| Median [P25th, P75th] | 9 [7;11] | 11 [9;13] | ||||
| N (Range) | 178 (5–21) | 11 (6–15) | ||||
| < 7y | 47 (26.40%) | 1 (9.09%) | [Ref] | |||
| 8–9 y | 49 (27.53%) | 2 (18.18%) | 1.92 (0.17;21.87) | 0.6 | ||
| 10–11y | 37 (20.79%) | 3 (27.27%) | 3.81 (0.38;38.15) | 0.25 | ||
| > 11 y | 45 (25.28%) | 5 (45.45%) | 5.22 (0.59;46.46) | 0.13 | ||
| Sex | Stallion | N (%) | 27 (15.0%) | 0 (0.0%) | [Ref] | 0.14 |
| Mare | N (%) | 76 (42.2%) | 8 (72.7%) | |||
| Gelding | N (%) | 77 (42.8%) | 3 (27.3%) | |||
| Mare vs other | N (%) | 3.65 (0.94;14.2) | 0.06 | |||
| Vaccination | No | N (%) | 119 (72.1%) | 4 (40%) | ||
| Yes | N (%) | 46 (27.9%) | 6 (60%) | 3.88 (1.05;14.38) | 0.04 | |
| Fever | No | N (%) | 51 (28.3%) | 0 (0%) | ||
| Yes | N (%) | 129 (71.7%) | 11 (100%) | NE | 0.03 | |
| Maximal Temperature | °C | Mean (SD) | 38.3 (0.67) | 38.1 (1.2) | 0.72 (0.27; 1.96) | 0.52 |
| Median [P25th, P75th] | 38.0 [37.8; 37.8] | 37.8 [37.6; 37.,6] | ||||
| N (Range) | 112 (37.1–40.0) | 9 (36.0–40.0) | ||||
| Neurologic signs | No | N (%) | 102 (56.7%) | 0 (0%) | ||
| Yes | N (%) | 78 (43.3%) | 11 (100%) | NE | < 0.001 | |
| Grade of ataxia | 0 to 5 | Median [P25th, P75th] | 0.0 [0.0; 0.0] | 5.0 [5.0; 5.0] | 8.3 (2.6; 26.6) | < 0.001 |
| N (Range) | 171 (0–5) | 10 (2–5) |